NHibernate is an actively developed, fully featured, open source object-relational mapper for the .NET framework. It is used in thousands of successful projects. It's built on top of ADO.NET and the current version is NHibernate 4.0.4. This tutorial will give you an idea of how to get started with NHibernate. The main goal is that after completing it, you will have a better understating of what NHibernate is and why you need NHibernate and of course learn how to add NHibernate to your project.